Test 1 - EPT312 (Objectives)

The velocity ratio of two pulleys connected by an open belt or crossed belt is

• directly proportional to their diameters

• inversely proportional to their diameters

• directly proportional to the square of their diameters

• inversely proportional to the square of their diamters

Due to slip of the belt, the velocity ratio of the belt drive

• decreases

• increases

• does not change

The centrifugal tension in belts

• increases power transmitted

• decreases power transmitted

• have no effect on the power transmitted

• increases power transmitted upto a certain speed and then decreases

When the belt is stationary, it is subjected to some tension, known as initial tension. The valuw of this tension is equal to the

• tension in the tight side of the belt

• tension in the slack side of the belt

• sum of the tension in the tight side and slack side of the belt

• average tension of the tight side and slack side of the belt

The raltion between the pitch of the chain (p) and pitch circle diameter of the sprocket (d) is given by

The size of a gear is usually specified by

• pressure angle

• circular pitch

• diametral pitch

• pitch circle diamter

The radial distance of a tooth from the pitch circle to the bottom, is called

• dedendum

• addendum

• clearance

• working depth

The condition of correct gearing is

• pitch line velocities of teeth be same

• radius of curvature of two profiles be same

• common normal to the pitch surface cuts the line of centers at a fixed point

• none of the listed

In a gear train, when the axes of the shafts, over which the gears are mounted, move relative to a fixed axis, is called

• simple gear train

• compound gear train

• reverted gear train

• epicyclic gear train

In a simple gear train, if the number of idle gears is odd, then the motionof driven gear will

• be same as that of driving gear

• be opposite as that of driving gear

• depend upon the number of teeth on the driving gear

• none of the above